Question

In: Biology

Given that they came from an aquatic habitat, what problems did vertebrates need to solve to...

Given that they came from an aquatic habitat, what problems did vertebrates need to solve to adapt to a terrestrial environment? How has evolution solved these problems?

Solutions

Expert Solution

The main problems vertebrates coming from water needed to solve to adapt to the terrestrial environment were the following:

the problem to avoid dehydration; the problem of elimination of wastes in a medium where water is less available; the problem of protection against harmful solar radiation; the problem of gamete locomotion in the fertilization environment; the problem of gas exchange, earlier done by direct contact of water with gills; the problem of body support, since it was water that played this role in fishes.

Solutions for the dehydration problem: thicker and impermeable skin, to lose less water, or moist and permeable skin, like in amphibians.

Solution for the excretion problem: excretion of urea (also excreted by chondrichthyes) or uric acid, substances that need less water to be dissolved.

Solutions for the problem of protection against radiation: skin pigments that filter harmful radiation, feathers, hair or carapaces.

Solution for the gamete movement problem: internal fecundation (except for most amphibians, that have external fecundation).

Solution for the gas exchange problem: appearing of airways and lungs.

Solution for the body support problem: further development of muscular and bony structures, like limbs and claws.


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